Let us calculate the total amount of energy that passes through the array per 1 second:
"I\\cdot A\\cdot 10 = 1.4\\,\\mathrm{kW\/m^2}\\cdot1.6\\,\\mathrm{m}^2\\cdot10 = 22.4\\,\\mathrm{kW}."
If the total output is 2.3 kW, we can calculate the efficiency
"\\eta = \\dfrac{2.3\\,\\mathrm{kW}}{22.4\\,\\mathrm{kW}} \\approx 0.10 = 10\\%."
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